Swiatek – the top seed in the competition – got off to a routine start in a dominant 33-minute first set, but the world No 52 Sakkari battled back, forcing a decider as she claimed her first set in five matches against the Pole.
Sakkari was made to pay for a missed match point at 5-2 in the deciding set when Swiatek won three straight games to bring the match back to level.
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Her opponent, though, held her own serve and then claimed the crucial break in the final game to book her place in the semi-finals.
The Greek will next face the winner of the quarter-final between Karolina Muchova and Anna Kalinskaya as she looks to win a third WTA singles title and first since 2023.
